Sensing the characteristic acoustic impedance of a fluid utilizing acoustic pressure waves

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• 作者：Hannes Antlinger ; Stefan Clara ; Roman Beigelbeck ; Samir Cerimovic ; Franz Keplinger ; Bernhard Jakoby
• 关键词：Pressure waves ; Fluid properties ; Characteristic acoustic impedance ; Liquid condition monitoring ; Viscosity sensors ; Ultrasonic sensors
• 刊名：Sensors and Actuators A: Physical
• 出版年：2012
• 出版时间：October, 2012
• 年：2012
• 卷：186
• 期：Complete
• 页码：94-99
• 全文大小：983 K

文摘

Ultrasonic sensors can be used to determine physical fluid parameters like viscosity, density, and speed of sound. In this contribution, we present the concept for an integrated sensor utilizing pressure waves to sense the characteristic acoustic impedance of a fluid. We note that the basic setup generally allows to determine the longitudinal viscosity and the speed of sound if it is operated in a resonant mode as will be discussed elsewhere. In this contribution, we particularly focus on a modified setup where interferences are suppressed by introducing a wedge reflector. This enables sensing of the liquid's characteristic acoustic impedance, which can serve as parameter in condition monitoring applications. We present a device model, experimental results and their evaluation.